/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jute.compiler;

import java.util.ArrayList;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;

/**
 * C++ Code generator front-end for Hadoop record I/O.
 */
class CGenerator {
	private ArrayList<JFile> mInclFiles;
	private String mName;
	private ArrayList<JRecord> mRecList;
	private final File outputDirectory;

	/**
	 * Creates a new instance of CppGenerator
	 *
	 * @param name            possibly full pathname to the file
	 * @param ilist           included files (as JFile)
	 * @param rlist           List of records defined within this file
	 * @param outputDirectory
	 */
	CGenerator(String name, ArrayList<JFile> ilist, ArrayList<JRecord> rlist, File outputDirectory) {
		this.outputDirectory = outputDirectory;
		mName = (new File(name)).getName();
		mInclFiles = ilist;
		mRecList = rlist;
	}

	/**
	 * Generate C++ code. This method only creates the requested file(s) and
	 * spits-out file-level elements (such as include statements etc.) record-level
	 * code is generated by JRecord.
	 */
	void genCode() throws IOException {
		if (!outputDirectory.exists()) {
			if (!outputDirectory.mkdirs()) {
				throw new IOException("unable to create output directory " + outputDirectory);
			}
		}
		FileWriter c = new FileWriter(new File(outputDirectory, mName + ".c"));
		FileWriter h = new FileWriter(new File(outputDirectory, mName + ".h"));

		h.write("/**\n");
		h.write("* Licensed to the Apache Software Foundation (ASF) under one\n");
		h.write("* or more contributor license agreements.  See the NOTICE file\n");
		h.write("* distributed with this work for additional information\n");
		h.write("* regarding copyright ownership.  The ASF licenses this file\n");
		h.write("* to you under the Apache License, Version 2.0 (the\n");
		h.write("* \"License\"); you may not use this file except in compliance\n");
		h.write("* with the License.  You may obtain a copy of the License at\n");
		h.write("*\n");
		h.write("*     http://www.apache.org/licenses/LICENSE-2.0\n");
		h.write("*\n");
		h.write("* Unless required by applicable law or agreed to in writing, software\n");
		h.write("* distributed under the License is distributed on an \"AS IS\" BASIS,\n");
		h.write("* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n");
		h.write("* See the License for the specific language governing permissions and\n");
		h.write("* limitations under the License.\n");
		h.write("*/\n");
		h.write("\n");

		c.write("/**\n");
		c.write("* Licensed to the Apache Software Foundation (ASF) under one\n");
		c.write("* or more contributor license agreements.  See the NOTICE file\n");
		c.write("* distributed with this work for additional information\n");
		c.write("* regarding copyright ownership.  The ASF licenses this file\n");
		c.write("* to you under the Apache License, Version 2.0 (the\n");
		c.write("* \"License\"); you may not use this file except in compliance\n");
		c.write("* with the License.  You may obtain a copy of the License at\n");
		c.write("*\n");
		c.write("*     http://www.apache.org/licenses/LICENSE-2.0\n");
		c.write("*\n");
		c.write("* Unless required by applicable law or agreed to in writing, software\n");
		c.write("* distributed under the License is distributed on an \"AS IS\" BASIS,\n");
		c.write("* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n");
		c.write("* See the License for the specific language governing permissions and\n");
		c.write("* limitations under the License.\n");
		c.write("*/\n");
		c.write("\n");

		h.write("#ifndef __" + mName.toUpperCase().replace('.', '_') + "__\n");
		h.write("#define __" + mName.toUpperCase().replace('.', '_') + "__\n");

		h.write("#include \"recordio.h\"\n");
		for (Iterator<JFile> i = mInclFiles.iterator(); i.hasNext();) {
			JFile f = i.next();
			h.write("#include \"" + f.getName() + ".h\"\n");
		}
		// required for compilation from C++
		h.write("\n#ifdef __cplusplus\nextern \"C\" {\n#endif\n\n");

		c.write("#include <stdlib.h>\n"); // need it for calloc() & free()
		c.write("#include \"" + mName + ".h\"\n\n");

		for (Iterator<JRecord> i = mRecList.iterator(); i.hasNext();) {
			JRecord jr = i.next();
			jr.genCCode(h, c);
		}

		h.write("\n#ifdef __cplusplus\n}\n#endif\n\n");
		h.write("#endif //" + mName.toUpperCase().replace('.', '_') + "__\n");

		h.close();
		c.close();
	}
}
